N.M.ELECTRONICS

                 The objective of this project is to monitor the consumed energy and calculate the fare and using the RFID R/W card as prepaid card for paying the amount to EB substation. Normal exiting energy meter are Analog. This type of Energy meter needs the EB Employer for directly come to home to calculate the Amount for unit of Energy consumed by the consumer. Some time the EB Employer may enter the wrong consumed unit value. So it cause calculated amount for Energy unit may be higher or lower so it affects both EB and Consumer.

            This project avoids this type problem. It is the digital Energy meter so there is no reason for error occurs and there is no need for EB officer to come directly for take the reading.

            In this project we buy the RFID R/W prepaid card for particular amount from the EB office. So we can avoid standing in the queue in the EB office to pay the EB bill.  This project also improves the security performance because we cannot make the duplicate RFID card.   

             This project is designed with

Ø  RFID R/W tag

Ø  RFID R/W reader

Ø  Microcontroller

Ø  RS 232 converter

Ø  Driver circuit

Ø  Alarm

Ø  PC

Ø  Key pad

 RFID R/W is the special type wireless card which has inbuilt the embedded chip along with loop antenna. The inbuilt embedded chip represents the 12 digit card number. In the R/W card we can read as well as write the information on the card. 

        RFID R/W reader is the circuit which generates 125KHZ magnetic signal. This magnetic signal is transmitted by the loop antenna connected along with this circuit which is used to read and write the information on the RFID card.

        In this project RFID R/W card is used as prepaid card and charged with some amount of money like Rs.100 and Rs.500 etc. This prepaid card is inserting in the Energy meter. The consumed energy is measured by IR transmitter and receiver.

      Infrared transmitter is one type of LED which emits infrared rays generally called as IR Transmitter. Similarly IR Receiver is used to receive the IR rays transmitted by the IR transmitter. One important point is both IR transmitter and receiver should be placed straight line to each other. Here the IR transmitter and receiver are placed in between the energy meter. We put holes in the energy meter disc. Initially the IR transmitter passes the rays to receiver.

              Whenever the disk is rotating it cuts the IR rays between Transmitter and Receiver. So the corresponding signal is given to microcontroller through signal and conditioning unit. So the inside the counter will increment the one value for each rotating.

Microcontroller will calculate the amount for each rotating and compare with RFID prepaid card amount. When the prepaid card amount is in the final microcontroller activates the alarm through driver circuit. When prepaid card amount is completed microcontroller will activate the relay for tripping the incoming supply through driver circuit corresponding information will be displayed in the LCD display. We can also recharge the RFID card for particular amount.

       If the RFID R/W card is not valid, the microcontroller will display the “Authentication Fail “on the LCD display and also activate the driver circuit for alarm.  So the alarm makes the sound for indicating the Authentication Fail.

1.      Low power consumption.

2.      Improve security performance in the energy meter.

3.      The consumed energy is calculated accurately.

4.       We avoid the unnecessarily waste the time for standing in the queue to pay the EB bill.

5.      We can also recharge the card for any amount. 

                        This project will be very much useful to EB distribution system.